Classes

of Water

Parameters

Suitability for Irrigation

TDS

mg/L

SO₄

mg/L

Cl

mg/L

EC

dS/m

SAR

%

I

0 - 700

0 - 192

0 - 142

0 - 0.75

<1

Excellent to good for irrigation

II

700 - 2000

192 - 480

142 - 355

0.75 - 2.25

5 - 11

Good to harmful suitable soil

III

>2000

>480

>355

>2.25

>23

Unfit for soil